Installation; Internal Switches - PCB Piezotronics IMI SENSORS 685A19 Installation And Operating Manual

Installation:

The vibration switch is sensitive to shock and vibration in all three planes of motion – up/down, front/back and
side/side. Side/side (in the same plane as the reset pushbutton) is the most sensitive. For maximum sensitivity,
mount the unit so that the side with the reset button is in-line with the direction of rotation of the machine.
The vibration switch must be firmly attached/mounted to the machine so that all mounting surfaces are in rigid
contact with the mounting surface of the machine. For best results, mount the instrument in-line with the direction
of rotating shafts and/or near bearings. In other words, the reset push button should be mounted pointing into the
direction of shaft rotation. It may be necessary to provide a mounting plate or bracket to attach the 685Ax9 to the
machine. The mounting bracket should be thick enough to prevent induced acceleration/vibration upon the 685x9.
Typically 1/2 in. (13mm) thick plate is sufficient.
CAUTION: A dust boot is provided on the reset pushbutton for all series to prevent moisture or dust intrusion. The
sensitivity adjustment has an o-ring compression seal; if possible, the mounting orientation should be on a
horizontal plane or with the sensitivity adjustment pointing down if possible.
1) Firmly secure the unit to the equipment using the base foot mount.
2) Make the necessary electrical connections to the vibration switch. See Internal Switches in the next section
for electrical terminal locations and for typical wiring. DO NOT EXCEED VOLTAGE OR CURRENT RATINGS
OF THE CONTACTS. Follow appropriate electrical codes/methods when making electrical connections. Be
sure that the run of electrical cable is secured to the machine and is well insulated from electrical shorting.
Use of conduit is recommended.
NOTE: If the electrical cable crosses a pivot point such as at the pivot of the walking beam, be sure to
allow enough slack in the cable so that no stress is placed on the cable when the beam moves.
If conduit is not used for the entire length of wiring, conduit should be used from the electrical supply box to a
height above ground level that prevents damage to the exposed cable from the elements, rodents, etc. or as
otherwise required by applicable electrical codes. If conduit is not attached directly to the switch, use a strain relief
bushing and a weatherproof cap on the exposed end of the conduit. A "drip loop" should be provided in the cable
to prevent moisture from draining down the cable into the conduit should the weatherproof cap fail.

Internal Switches

The vibration switch uses 2 SPDT switch terminals with removable screws for all connections (see below). Wire
the relays depending on application, either Normally Open or Normally Closed. The Normally Open and Normally
Closed are referenced to the Common screw terminal connector.
WARNING: Do not exceed the maximum relay ratings as noted below.
Rated
Voltage
AC 125V
AC 250V
AC 480V
DC 8V
DC 14V
DC 30V
DC 125V
DC 250V
Resistive Inductive
Load Load
15A 10A
15A 10A
3A 2A
15A 15A
15A 10A
6A 5A
0.5A 0.05A
0.25A 0.03A
Motor, Lamp Load
N.C N.O
4A 2A
3A 1.5A
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